Why should the throttle and idle valve be cleaned regularly?

Hello; Under normal circumstances, the throttle of the engine should not be tampered with. As long as you don't use inferior fuel and lubricating oil at ordinary times, you won't produce too much carbon. If the vehicle emits black smoke and the power drops, then the maintenance of the valve, piston ring and ignition system should be considered. Usually no maintenance is needed, which wastes money and accelerates the sealing effect of the engine, and will eventually appreciate.